Pokeshell

Pokeshell is a critter that lives in the Tide Pool Biome. They can live in both air and liquid and can be domesticated. They will consume both Rot Piles and Polluted Dirt at 140 kg/cycle and produce 50% of their intake as Sand.

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Behavior
Pokeshells drop Pokeshell Molt at the end of their life cycle and when combatted, which can be turned into Lime through Rock Crusher for Steel production. Normally, they are as non-hostile as other critters. However, once they are subjected to a room with finite size and laid a Pinch Roe in their reachable path, they will turn red and aggressive. When this happens, they will forage without producing material, attack duplicants and critters in their way (shown as "protecting" in status tab), and beat them to death without exceptions if left unattended. They calm down and return pink in innocent eyes again when they are timely wrangled and relocated to a different room (risk harming Duplicants), their eggs are extracted, or hatched to pokeshell spawns.

Feeding troubles
Both Rot Piles and Polluted Dirt are messy food sources, sublimating into Polluted Oxygen and thus naturally uncommon and transitory. Which makes feeding domestic Pokeshells quite a task.

Water Sieve
The most basic source of Polluted Dirt would be Water Sieve hooked up to a bathroom or an appropriate geyser. However, it makes Pokeshells compete for your dirt income and ties their population to your colony size. What is worse, one constantly running Water Sieve can't quite completely feed one Pokeshell.

Ethanol Distiller
Ethanol Distillers provide a reliable source of dirt, but since each Pokeshell needs 233 g/s of Polluted Dirt the player would need slightly more than 2 Ethanol Distillers running 100% of the time for each 3 domesticated Pokeshells.

Rotting food with Polluted Water
Pokeshells can be kept in Polluted Water, which increases spoiling time of submerged food. Therefore any unedible, but abundant food items can be thrown (via Automatic Dispenser or Conveyor Chute) into the pool to rot and feed crabs.
 * However, since most food items only weigh a kilo and they take time to be obtained, this method is not feasible without devoting a lot of space for farms.

Pacu cleanup
Due to their ability to live underwater Pokeshells can augment Pacu farm, serving as the second stage of processing. Each Pokeshell will require 2 Pacus to satiate it. Needless to say they will go through Algae reserves even faster.
 * However, the Pokeshells would leave their molts underwater, which can be problematic to retrieve.

Outhouse Cleanup
Pokeshells can be used to eat up polluted dirt emptied from outhouses to supply sand for deodorizer, serving as a medium for temporary clean oxygen solution in remote regions, or during early game. For each cycle, all Outhouses in a room needs to be visited by Duplicants at least 8 times in sum and emptied timely to satiate a Pokeshell. They can be kept in their innoctous mode for decacycles before laying an egg (Critters typically lay eggs by 2/3 of their life. Check age to avoid putting a egg-laying prone crab in dupe's frequent outhouse). However, once a Pinch Roe is laid, it's imperative to send dupes to attack the red pokeshell in protecting mode to prevent harm.

Keeping crabs wild
A reasonable alternative to domesticating Pokeshell is simply to wrangle all the wild Pokeshell in the map to a single room of decent size where they will remain a perpetual source of Pokeshell Molt for a supplemental amount of Lime. Be careful to disallow access to this room using door permissions so duplicants do not accidentally run into a mass of murderous Pokeshells if there are any Pokeshell eggs in the room.

Once domestication time comes, it is still better to start with one Pokeshell, and keep the rest of wild population self-sustaining.

Tips
Краб-щипач
 * The roof or floor segments made out of unpassable Pneumatic Doors can help with the safe egg extraction.
 * Spaced Out Logo.png Feeding Pokeshells with Polluted Dirt is easier in the DLC, due to the existence of asteroid types that have a lot of Polluted Dirt seams.